Sizing device for grinding machines



July 16, 1935. o. GURNEY I SIZING DEVICE FOR GRINDING MACHINES.

Filed Oct. 29, 1931 4 Sheets-Sheet l INVENTOR July 16, 1935. D. GURNEYSIZING DEVI GE FOR GRINDING MACHINES Filed Oct. 29, 1931 4 Sheets-Sheet2 D. GURNEY July 16, 1935.

SIZING DEVICE FOR GRINDING MACHINES Filed Oct. 29, 1931 4 Shets-Sheet sINVENTOR .@an/e/ fiam ef NEY July 16, 1935. o. GURNEY SIZING DEVICEFOEGRINDING MACHINES Filed Oct. 29, 1931 4 Sheets-Sheet 4 lllHlllHliiINVENTOR w n A M WM Patented July 16, 1935 ,UNITED STAT S SIZING DEVICEDaniel Gurney, Waynesboro, Pa., assignor to Landis Tool Company,Waynesboro, Pm, a corporation of Pennsylvania i Application October 29,1931, Serial No. 571,892

- '1 Claims. (01. 51-1s5i Sizing devices as heretofore constructed gagethe work by coming in contact with the work itself, suitable mechanismbeing provided to stop the feed of the grinding wheel when the'work is 5reduced approximately to finished size, and-then operatingto withdrawthe grinding wheel and operate other 'mechanism when the work is groundto its finished size and polished. This invention provides a sizingdevice having means engageable with the grinding wheel itself forcontrolling thesize of the work sothat when the grinding wheel reaches acertain predetermined position in its movement toward the workit isengaged by suitable fingers which are moved to set in operationmechanism for stopping further feeding of the grinding wheel toward thework and for slowing down either rotation or 'oscilla tion of the workor operating any other desired mechanism and further feeler fingers areprovided engageable with the grinding wheel when the work has beenground to finished size for stopping operation of the rotating oroscillating mechanism for the work and for withdrawing the grindingwheel out of. engagement with the work. By the use of the present devicea higher degree of accuracy of work is insured in that wear on thegrinding wheel will make no appreciable difference on the size of thework.

Among other objects of the invention are to,

Figure 3,' an enlarged end elevation showing one of the adjustablefeelerfingers,

Figure 4, an enlarged end elevation with the housing removed to showsome of the inner oper ating mechanism, v

Figure 5, an end elevation of a feeler finger looking in the directionof the arrow in Figure 3,

Figurefi, a plan view with the, top coverjremoved,

Figure 7, a plan view of the contact arm, and

Figure 8, a diagrammatic showing of the wiring. a

Figure 9-is a planview of a grinding machine showing the sizing devicemounted thereon.

In the drawings numeral I indicates a housing in which are mountedshafts I I and I2 which carry latches I3and l4. To the outer ends of theshafts H' and Here attached fingers l5 and ii in the ends of which areheld diamonds l1, adapted to engage the periphery of the grinding wheelIt. The fingers I5 and 16 are preferably made of some very lightmaterial such as aluminum. The finger I8 is securely clamped to the endof the shaft II. The finger I5 is secured to and adjustable on a blocklily Clamps 20 are secured to finger 15 by screws 2|, the free ends 'of.the clamps being secured against the sides of the block I! by screws 22,as shown in Figure 5. A screw 23 is secured in finger IS. The head ofthis screw is drilled and tapped to receive an adjusting screw 24. Theblock I9 is secured to the shaft H by means of a screw 9, the finger l5being slotted where the shaft l I passes through it to permit thenecessary adiustment of the finger on-the block ill. ,The latches l3 and14 are biased counterclockwise by springs 25. Arms 26 and '21 aremounted rotatably on a shaft 28 to the outer end of which shaft isattached a lever 29. The shaft 28 has'a crank 30 attachedto it, whichcrank has a pin 3| extending through its outer end which pin is adaptedto engage the upper sides of the arms 26 and. 21, to move them againstthe tension of springs 31 and 38. A spring 8 on shaft 28 and attached tolever 29 tends to hold lever 29 in elevated position. During a grindingoperation the ends of the arms 26 and 21 rest beneath the lower -ends ofthe latches l3 and l4. ,The arms are in position to engage just a narrowedge on the lower arms of the latches so that a slight rotation of thelatch in a clockwise direction will permit the'end of the arm 26 and 21carry insulating blocks 34 and 35 which a are secured to thejarmsrbymeans :of screws 36. The armsjf'are'jbiased-1, I ykmeans of springsfland 38-.- C'ont 'springs-. 9;" have bentlends which carrylcontact points4| and 42 which are adapted itoibe brought into contact with points;44and 43,;on sp1jingfarms 46 and 45.

Contact points flami; 4.-sre;in theme with a battery llthroii nsolenoids or'other electric responsive devices ill and 5|. Thesesolenoids may control any suitable mechanism on the grinding machinesuch for example as means for stopping feeding of the grinding wheeltoward the work and for slowing down oscillation of the work or rotationof the work or any other mechanism, the speed of which should be changedwhen the work has been reduced substantially to its finished size.Contacts-42 and 43 are in circuit with the battery 41 through solenoids48 and 49. Contacts 42 and 43 are brought together when the work hasbeen ground to its finished size. Solenoids 48 and 49 therefore maycontrol means for withdrawing the grinding wheel from the work and forstopping operation ofsuch mechanism as should be stopped when the'workhas been ground to finished size. The base In of the sizing device ismounted upon a slide 52 which is adjustable toward and from the work bymeans of screw 53 which is threaded through a bracket 54 on base Ill.The slide 52 moreover is pivoted at 55 to a block 56 which in turn ismounted for further adjustment on a bridge 51. The bridge is secured toa carriage 59 by. T-bolts 58 and is.

adjustable axially of the work. v

The sizing device may-be mounted upon any suitable grindingflmachinesuch, for example, as that shown in Figure 9. The particular type ofgrinding machine here shown is an internal grinding machine having abase 60 with a suitable work support 6| .mounted thereon. The worksupport carries a work holding device 62 showing'work 53 supportedtherein. The work is rotated by a suitable motor 54. A wheel support 65has a wheel spindle 66 carrying a grinding wheel IS. The wheel spindleis driven by a motor 61. Cross feed mechanism 68 of conventional andwell known construction is provided. This cross feed may be manuallyoperated by hand wheel 69 or automatically effected by precisionmechanism 10.

In operation the feeler fingers are in a position, so that the diamondlies exactly on a center line joining the axis of the wheel and thepivots of the fingers. As the grinding wheel moves into the work itsperiphery contacts with the diamond in the feeler fingers. As soon asthe diamondin feeler finger I is touched by the grinding wheel thefinger will be rocked on its pivot. This rocks the latch l3 clockwisepermitting the end of the feeding of the grinding wheel toward the workand to operate any other mechanism which it may be desirable to controlat this stage of the grinding. The grinding wheel continues to polish Ithe work until the diamond in finger l6 contacts with the work. Whenthis occurs this finger is lifted to rotate shaft l2 in a clockwisedirection to permit arm 21 to slip off the end of thelatch l4 so thatthis arm will rotate the latch in a clockwise direction to lift feelerfinger 16 away from the wheel. When arm 21 reaches its uppermostposition'insulating block 3.5 lifting arm 40 willbring together contacts42 and 43. This will stop further feeding of the grinding Wheel and willset in operation or stop operation of such mechanism as should beoperated or stopped from -operation when the work has been reduced toits finished and polished form. From the foregoing description it willbe apparent that at all times i gage the position of the grindingwheel-in its .throughout. My device gages the position of the peripheryof the grinding wheel so that any slight irregularities in the work willnot influence the gage or sizing device. I

It will be obvious to those skilled in the art that various changes maybe made in my device with out departing from the spirit of the inventionand therefore I do not limit myself to what is shown in the drawings anddescribed in the specification, but only as indicated by the appendedclaims.

Having thus fully described my said invention, what I claim as new anddesire to secure by Letters Patent, is:

l. A sizing device for grinding machines comprising a plurality offingers having hardened points adapted to engage the periphery'of agrinding wheel when the work has been reduced to a predetermined size, aplurality of solenoids in control of the operative mechanism of themachine, switches in said control line, and means operable by engagementof the fingers with the grinding wheel for first throwing the fingersfree of the grindingwheel and thereafter instantly closing the saidswitches to operate the said sole noids substantially as set forth.

2. In a grinding machine having. a plurality of solenoids in control ofall operative mechanism on the machine, a plurality of switches incontrol of circuits for energizing the solenoids, a pair of fingerspositioned with their ends arfiacent to but normally out of contact withthe periphery of the grinding wheel, said fingers being biased in adirection to close the said switches, a latch for holding each of saidfingers in position to maintain the switches in open condition, engage-'ment of the periphery of the grinding wheel first 'with one of saidfingers and then with another causing said' latches to release mechanismfor closing said switches to energize the said solenoids, substantiallyas set forth.

3. In a grinding machine having a plurality of solenoids in control ofmechanism for operating the various elements of the grinding ma-' chine,a pair" of shafts each having a finger mounted thereon, the fingerextending toward the periphery'of the grinding wheel, a latch on saidshaft said latch being engageable by an arm for holding the fingerextended towardthe grinding wheel, a pair of switches in control ofcircontact of another finger with the grinding wheel causing cessationof other operations, substantially as set forth.

4. In a grinding machine having a plurality of solenoids in control ofmechanism for operating the various elements of the grinding machine,

a pair of shafts each having a finger mounted thereon, the fingerextending towardthe periphery of the grinding wheel, a latch on saidshaft an arm engageable with said latch for holding the finger extendedtoward the grinding wheel,

grinding wheel when the 1atch,,is released from the said arm,substantially as set forth.

5. In a device of the kind described a grinding wheel, a feeler adaptedto engage said grinding wheel at a predetermined point in a grindingoperation, electrical contacts adapted to be actuated by said feeler"and means responsive to the rotary movement of said wheel to actuatesaid feeler, and means operable upon the actuation of saidieeler-forremoving it out of engagement with the wheel.

3. In a device of the kind described a wheel support, a grinding wheelmounted thereon,

means to r'otate'said wheel, a work support,

means to effect arelative feeding movement be-v tween said supports, afeeler adapted to engage said wheel at a predetermined point: in saidgrinding operation and means to separate said feelenandsaid wheelimmediately after said engagement. H

'1. In a device of the kind described a wheeli support, a grinding wheelrotatably mounted therein, means to rotate said wheel, means to movesaid wheel support, feelers in the path-of the said wheel and adapted toengage said wheel at a predetermined point in a grinding operation, anelectric circuit, contacts on said feelers for opening and closing saidcircuit and means to gagement contacts.

DANIEL GURNEY.

throw said feelers clear of the wheel upon entherewith and therebyto'close'said 20

